Comments

Cookies are profoundly broken, and there is no viable work-around. Operators munge the device ID so that it is indecipherable without a partnership with the operator.
You can’t send links to a Verizon customer and have it work. They’ve removed the ability to follow a link in SMS (at least on some phones).
Slow processor speed.
Poor site design in some cases.
LONG browser launch times (and the inability to leave the browser running).
Lack of billing transparency for per-kB data plans – how much is this going to cost?

One assumes that you disclosed this when you applied for a speaking slot!
Or rather, I imagine you were invited to be able to dislose the state of affairs over in Europe – ther than recount the audience’s problems back to them.
I’ll see you there